Ubuntu 20.04 LTS / 22.04 LTS / 24.04 LTS : libxml2 vulnerabilities (USN-7240-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-7240-1. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('compat.inc');

if (description)
{
  script_id(214777);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/10/13");

  script_cve_id("CVE-2022-49043", "CVE-2024-34459");
  script_xref(name:"USN", value:"7240-1");
  script_xref(name:"IAVA", value:"2024-A-0067-S");

  script_name(english:"Ubuntu 20.04 LTS / 22.04 LTS / 24.04 LTS : libxml2 vulnerabilities (USN-7240-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 20.04 LTS / 22.04 LTS / 24.04 LTS host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-7240-1 advisory.

    It was discovered that libxml2 incorrectly handled certain memory operations. A remote attacker could use
    this issue to cause libxml2 to crash, resulting in a denial of service, or possibly execute arbitrary
    code. (CVE-2022-49043)

    It was discovered that the libxml2 xmllint tool incorrectly handled certain memory operations. If a user
    or automated system were tricked into running xmllint on a specially crafted xml file, a remote attacker
    could cause xmllint to crash, resulting in a denial of service. (CVE-2024-34459)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/notices/USN-7240-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2024-34459");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2022-49043");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2024/02/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/01/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/01/29");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libxml2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libxml2-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libxml2-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python-libxml2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3-libxml2");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"II");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Ubuntu Local Security Checks");

  script_copyright(english:"Ubuntu Security Notice (C) 2025 Canonical, Inc. / NASL script (C) 2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('20.04' >< os_release || '22.04' >< os_release || '24.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 20.04 / 22.04 / 24.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);

var pkgs = [
    {'osver': '20.04', 'pkgname': 'libxml2', 'pkgver': '2.9.10+dfsg-5ubuntu0.20.04.8'},
    {'osver': '20.04', 'pkgname': 'libxml2-dev', 'pkgver': '2.9.10+dfsg-5ubuntu0.20.04.8'},
    {'osver': '20.04', 'pkgname': 'libxml2-utils', 'pkgver': '2.9.10+dfsg-5ubuntu0.20.04.8'},
    {'osver': '20.04', 'pkgname': 'python-libxml2', 'pkgver': '2.9.10+dfsg-5ubuntu0.20.04.8'},
    {'osver': '20.04', 'pkgname': 'python3-libxml2', 'pkgver': '2.9.10+dfsg-5ubuntu0.20.04.8'},
    {'osver': '22.04', 'pkgname': 'libxml2', 'pkgver': '2.9.13+dfsg-1ubuntu0.5'},
    {'osver': '22.04', 'pkgname': 'libxml2-dev', 'pkgver': '2.9.13+dfsg-1ubuntu0.5'},
    {'osver': '22.04', 'pkgname': 'libxml2-utils', 'pkgver': '2.9.13+dfsg-1ubuntu0.5'},
    {'osver': '22.04', 'pkgname': 'python3-libxml2', 'pkgver': '2.9.13+dfsg-1ubuntu0.5'},
    {'osver': '24.04', 'pkgname': 'libxml2', 'pkgver': '2.9.14+dfsg-1.3ubuntu3.1'},
    {'osver': '24.04', 'pkgname': 'libxml2-dev', 'pkgver': '2.9.14+dfsg-1.3ubuntu3.1'},
    {'osver': '24.04', 'pkgname': 'libxml2-utils', 'pkgver': '2.9.14+dfsg-1.3ubuntu3.1'},
    {'osver': '24.04', 'pkgname': 'python3-libxml2', 'pkgver': '2.9.14+dfsg-1.3ubuntu3.1'}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (osver && pkgname && pkgver) {
    if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) flag++;
  }
}

if (flag)
{
  var extra = '';
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'libxml2 / libxml2-dev / libxml2-utils / python-libxml2 / etc');
}